mm/pin_mem: add PG_hotreplace to mark pages need hotreplaced

euleros inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4QPBH
CVE: NA

------------

Use PG_hotreplace flag to mark pin pages which need to be hotreplaced
to the recover process.
Signed-off-by: NJingxian He <hejingxian@huawei.com>
Reviewed-by: Kefeng Wang<wangkefeng.wang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

include/linux/page-flags.h

@@ -140,6 +140,9 @@ enum pageflags {
 	PG_arch_2,
 #endif
 	PG_pool,		/* Used to track page allocated from dynamic hugetlb pool */
+#ifdef CONFIG_PIN_MEMORY
+	PG_hotreplace,
+#endif
 
 	/* Add reserved page flags for internal extension. For the new page
 	 * flags which backported from kernel upstream, please place them
@@ -431,6 +434,12 @@ PAGEFLAG_FALSE(Mlocked) __CLEARPAGEFLAG_NOOP(Mlocked)
 	TESTSCFLAG_FALSE(Mlocked)
 #endif
 
+#ifdef CONFIG_PIN_MEMORY
+PAGEFLAG(Hotreplace, hotreplace, PF_ANY)
+#else
+PAGEFLAG_FALSE(Hotreplace)
+#endif
+
 #ifdef CONFIG_ARCH_USES_PG_UNCACHED
 PAGEFLAG(Uncached, uncached, PF_NO_COMPOUND)
 #else

include/trace/events/mmflags.h

@@ -87,6 +87,12 @@
 #define IF_HAVE_PG_ARCH_2(flag,string)
 #endif
 
+#ifdef CONFIG_PIN_MEMORY
+#define IF_HAVE_PG_HOTREPLACE(flag, string) ,{1UL << flag, string}
+#else
+#define IF_HAVE_PG_HOTREPLACE(flag, string)
+#endif
+
 #define __def_pageflag_names						\
 	{1UL << PG_locked,		"locked"	},		\
 	{1UL << PG_waiters,		"waiters"	},		\
@@ -115,7 +121,8 @@ IF_HAVE_PG_UNCACHED(PG_uncached,	"uncached"	)		\
 IF_HAVE_PG_HWPOISON(PG_hwpoison,	"hwpoison"	)		\
 IF_HAVE_PG_IDLE(PG_young,		"young"		)		\
 IF_HAVE_PG_IDLE(PG_idle,		"idle"		)		\
-IF_HAVE_PG_ARCH_2(PG_arch_2,		"arch_2"	),		\
+IF_HAVE_PG_ARCH_2(PG_arch_2,		"arch_2"	)		\
+IF_HAVE_PG_HOTREPLACE(PG_hotreplace,	"hotreplace"	),		\
 	{1UL << PG_reserve_pgflag_0,	"reserve_pgflag_0"},		\
 	{1UL << PG_reserve_pgflag_1,	"reserve_pgflag_1"}